There are plenty of PDF's already available online, but finding them can be a needle in a haystack. While Google includes them in the search results, they are mixed in with the regular websites. Rather, a more specific tool is needed.
PDF Search Engine is devoted to finding PDF's, and only PDF's. I ran a few searches through it, and it does find the content. Although it is not always exactly laser accurate, it is worth a try.
PDF Search Engine
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